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Message #05682
[Bug 1347147] Re: krb5 database propagation enters infinite loop
** Bug watch added: GCC Bugzilla #61964
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61964
** Also affects: gcc via
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61964
Importance: Unknown
Status: Unknown
** Bug watch added: krbdev.mit.edu/rt/ #7860
http://krbdev.mit.edu/rt/Ticket/Display.html?id=7860
** Also affects: kerberos via
http://krbdev.mit.edu/rt/Ticket/Display.html?id=7860
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1347147
Title:
krb5 database propagation enters infinite loop
Status in The GNU Compiler Collection:
Unknown
Status in Network Authentication System:
Unknown
Status in “gcc-4.8” package in Ubuntu:
New
Status in “krb5” package in Ubuntu:
Confirmed
Bug description:
In some conditions, propagating a kerberos database to a slave KDC server can stall.
This is due to a misoptimization by gcc 4.8 of the CIRCLEQ famliy of macros, apparently due to overzealous strict aliasing deductions.
One case of this stall is reported at
http://mailman.mit.edu/pipermail/kerberos/2014-July/020007.html (and
the rest of the thread), and there is an entry in the upstream
bugtracker at http://krbdev.mit.edu/rt/Ticket/Display.html?id=7860 .
gcc 4.9 (as used in Debian unstable at present) is not believed to
induce this problem. Upstream has patched their code to use the TAILQ
family of macros instead, as a workaround, but that workaround has not
yet appeared in an upstream release:
https://github.com/krb5/krb5/commit/26d8744129
Because of the different compiler versions used on Debian and Ubuntu,
I am filing this as an Ubuntu-specific bug.
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References